Jiazheng Sun, Xudong Tian, Zhenghan Zhang, Jing Liu, Lei Han, Fanrong Xu, Han Jiang, Chao Ma, Hongwei Guo, Cong Lin, Qike Jiang, Guangchao Li, Tsz Woon Benedict Lo, Haitao Song, Wei Lin, Le Xu, Jian Li
Stable extra-large-pore zeolites are highly desirable for catalysis and molecular separation, but most remain microporous, limiting their effectiveness for bulky substrates. Among the few extra-large-pore zeolites that exhibit mesoporosity, the pores typically form as elongated, noncircular pore apertures. We report that NJU120-6, a stable silicate zeolite with an intrinsic cylindrical mesoporous system, has the currently largest 36-ring windows with a free diameter of 25.71 angstroms by 19.12 angstroms. NJU120-6 exhibits the lowest framework density of 9.39 silicon atoms per cubic nanometer and a pore volume of 0.66 cubic centimeters per gram. It remains stable up to 1173 kelvin and can incorporate aluminum and titanium, enabling superior performance in catalytic cracking and in liquid-phase alkene oxidation of bulky molecules, respectively.